The southward migration of the Antarctic Circumpolar Current enhanced oceanic degassing of carbon dioxide during the last two deglaciations
Détails
Télécharger: Ai_et_al-2024-Communications_Earth_&_Environment.pdf (2375.96 [Ko])
Etat: Public
Version: Final published version
Licence: CC BY 4.0
Etat: Public
Version: Final published version
Licence: CC BY 4.0
ID Serval
serval:BIB_4EF79FDF0D05
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
The southward migration of the Antarctic Circumpolar Current enhanced oceanic degassing of carbon dioxide during the last two deglaciations
Périodique
Communications Earth & Environment
ISSN
2662-4435
Statut éditorial
Publié
Date de publication
30/01/2024
Peer-reviewed
Oui
Volume
5
Numéro
1
Langue
anglais
Résumé
Previous studies suggest that meridional migrations of the Antarctic Circumpolar Current may have altered wind-driven upwelling and carbon dioxide degassing in the Southern Ocean during past climate transitions. Here, we report a quantitative and continuous record of the Antarctic Circumpolar Current latitude over the last glacial-interglacial cycle, using biomarker-based reconstructions of surface layer temperature gradient in the southern Indian Ocean. The results show that the Antarctic Circumpolar Current was more equatorward during the ice ages and shifted ~6° poleward at the end of glacial terminations, consistent with Antarctic Circumpolar Current migration playing a role in glacial-interglacial atmospheric carbon dioxide change. Comparing the temporal evolution of the Antarctic Circumpolar Current mean latitude with other observations provides evidence that Earth’s axial tilt affects the strength and latitude range of Southern Ocean wind-driven upwelling, which may explain previously noted deviations in atmospheric carbon dioxide concentration from a simple correlation with Antarctic climate.
Mots-clé
Palaeoceanography, Palaeoclimate
Open Access
Oui
Financement(s)
Fonds national suisse / PP00P2_144811
Fonds national suisse / PP00P2_172915
Fonds national suisse
Création de la notice
31/01/2024 9:52
Dernière modification de la notice
12/07/2024 6:11